Omega Engineering OMB-DBK-34A, User Manual

Page: 211 / 250

The following table lists values of components for common corner frequencies in Butterworth filters. If designing
your own filter, software from Burr-Brown provides the component values to create the desired filter. Note that
the design math is beyond the scope of this manual.
3-Pole Butterworth Filter Components
3dB (Hz) RCnA RCnB RCnC RCnD RCnE RCnF RCnG RCnH
0.05
3.16 M
Ω
1 µF none
3.16 M
Ω
1 µF
3.16 M
Ω
none 1 µF
0.10
1.58 M
Ω
1 µF none
1.58 M
Ω
1 µF
1.58 M
Ω
none 1 µF
0.20
787 k
Ω
1 µF none
787 k
Ω
1 µF
787 k
Ω
none 1 µF
0.50
3.16 M
Ω
0.1 µF none
3.16 M
Ω
0.1 µF
3.16 M
Ω
none 0.1 µF
1
1.58 M
Ω
0.1 µF none
1.58 M
Ω
0.1 µF
1.58 M
Ω
none 0.1 µF
2
787 k
Ω
0.1 µF none
787 k
Ω
0.1 µF
787 k
Ω
none 0.1 µF
5*
3.16 M
Ω
0.01 µF none
3.16 M
Ω
0.01 µF
3.16 M
Ω
none 0.01 µF
10*
1.58 M
Ω
0.01 µF none
1.58 M
Ω
0.01 µF
1.58 M
Ω
none 0.01 µF
20
787 k
Ω
0.01 µF none
787 k
Ω
0.01 µF
787 k
Ω
none 0.01 µF
50
3.16 M
Ω
0.001µF none 3.16 M
Ω
none
3.16 M
Ω
none none
100*
1.58 M
Ω
0.001µF none 1.58 M
Ω
none
1.58 M
Ω
none none
200
787 k
Ω
0.001µF none 787 k
Ω
none
787 k
Ω
none none
500*
316 k
Ω
0.001µF none 316 k
Ω
none
316 k
Ω
none none
1000*
158 k
Ω
0.001µF none 158 k
Ω
none
158 k
Ω
none none
2000
78.7 k
Ω
0.001µF none 78.7 k
Ω
none
78.7 k
Ω
none none
5000
31.6 k
Ω
0.001µF none 31.6 k
Ω
none
31.6 k
Ω
none none
10000
15.8 k
Ω
0.001µF none 15.8 k
Ω
none
15.8 k
Ω
none none
*These pre-configured Butterworth frequency modules are available from the manufacturer.
You have the option to configure the filter sections as band-pass filters rather than low-pass filters. The
component selection program provides band-pass component values. The program also computes and
displays phase and gain characteristics of the filter sections as a function of frequency.
Software Setup
Reference Notes :
o
DaqView users - Refer to chapter 3, DBK Setup in DaqView .
o
LogView users - Refer to chapter 4, DBK Setup in LogView .
DBK Option Cards and Modules
918894
DBK18, pg. 5